DF36A-40S-0.4V(51) from Hirose Electric Co Ltd is a 40-position rectangular receptacle designed for fine-pitch board-to-cable or wire interconnect applications where compact size, secure mating, and SMT assembly are important. With a 0.40 mm pitch, friction lock, metal cover, and solder retention features, it is well suited for space-constrained electronics such as portable devices, industrial control modules, compact display systems, and embedded assemblies requiring reliable signal connection. The LCP halogen-free housing, UL94 V-0 flammability rating, and gold-plated contacts support stable performance in demanding production environments. Based on the supplied specifications, the part is listed as Active, which is favorable for ongoing design use, although lifecycle should still be confirmed with the manufacturer for long-term programs. RoHS compliance information is not explicitly provided in the input data, so official compliance status is information not available here and should be verified through Hirose documentation or authorized sourcing channels before release to production.